91影视

When testing the significance of the correlation coefficient, what is the alternative hypothesis?

A vacation resort rents SCUBA equipment to certified divers. The resort charges an up-front fee of $\backslash (25$and another fee of $\backslash )12.50$an hour.

Graph the equation from Exercise 12.2.

If the level of significance is 0.05 and the p-value is 0.04, what conclusion can you draw?

How many acres will be left to mow after $20$hours of work?

Graph 鈥測ear鈥� versus 鈥�# flu cases diagnosed鈥� (plot the scatter plot). Do not include pre-1981 data.

Perform linear regression. What is the linear equation? Round to the nearest whole number.

Solve.

a. When$x=1985,欧=\_\_\_\_\_$

b. When $x=1990,欧=\_\_\_\_\_$

c. When $x=1970,欧=\_\_\_\_\_\_$ Why doesn鈥檛 this answer make sense

A credit card company charges $\backslash (10$when a payment is late, and $\backslash )5$a day each day the payment remains unpaid.

Find the equation that expresses the total fee in terms of the number of days the payment is late.

Does the line seem to fit the data? Why or why not?

What does the correlation imply about the relationship between time (years) and the number of diagnosed flu cases reported in the U.S.?